Sand-blast nozzle



s. B. NEIKIRK I 1,757,207

SAND BLAST NOZZLE Filed Nov. l8 1927 INVENJTOR.

ATTORNEY.

' to the accompanying} drawings in which a cutting action which veryrapidly cuts away blast nozzle embodying my invention; and tive lifeofthe nozzle. a

' 50 paratus in which a homogeneous mixture of taper n'-om the inner endto the discharge we Patented May 6,1935 7 i a I 1,757 207? SAMUELNEIKIRK, or 1305:, Mrssonm sAnn-Brias'r NozzLE minimum filed Novemberis, 19 27 Seria1 N d.234,132. 1

i This invention relates to apparatus for air. and sand forming theblastis conveyed sand blasting and particularly to the conthrough a hostdirect to the nozzle, the inner struction of a nozzle which willconcentrate end of the nozzle is merely flared or provided thestream orjet of sand issuing from the with a short outward taper to meet theinner nozzle and project itwith greater force than walls ofthe hose inorder to avoid any ledge those heretofore employed. V orcorner whichwould catch the sand. Such a One of the objects of my invention is toprior constructions are shown for instance in provide a nozzlewhich'will not be rapidly U.,S. Patents Nos. 561,483 and 979,897 or inworn away by the sand as it issues from the French patent, to Sloan No.513,375 Febru- 10 month of the nozzle. Another object is'to ary 14:,1921. In these prior devicesthe sand provide anozzle which will producea strongwill clog just at the inner end of the flaring er blast thanthose nowin use with the same opening- 7 When this occurs the separatedair pressure. l 7 sand seems to'hugthe inner walls of the bore In thefollowingdescription I shall refer of the nozzle and at the outlet endproduces 7 Figure 1 is a diagrammatic illustration of an the metal andproduces an irregular enapparatus employed in sand blasting; Figurelarged discharge opening which greatly re- 2 is a longitudinal sectionalview of a sand duces 1 the .efficiency and shortens the operazc Figure3'is a longitudinal section of mynoz- The blast in nozzle remainssubstanzle illustrating the action of thesand in itstiallyhomogeneousthroughout and is gradpassage therethrough. r u'allyIconverged in its passage through they As is well understood by thosefamiliar f bore of the nozzle.- I have found by actual use with sandblasting, the sand is fed from a ofthese nozzles that there is notendency to 2.", receptacle such as shown at IOinFig. 1,'which cut themetal at the outlet or discharge end is usually maintained under an airpressure; of the nozzle and hence that I haveovercome of about 7 pounds.The'nozzle 12 is secured 1 the very radical defect in the nozzles ofsaid by a coupling 1 1 to a hose 15 connected to the prior construction.In addition to this, llOW- outlet of the sand receptacle. ever, I havegreatly increased the efliciency 0 I have discovered that the defectsabove of theblast. The velocity of the blast is inmentioned maybeovercome by providing the creased in its passage through the taperinginner end of the nozzle with an inlet chambore so 3 that the'cuttingaction of the blast ber 17 having an elongated conical wall eX- upon thework is increaseds everalfold. The tending to the line 18 in Figs. 2 and3, which .force of the concentrated blast issuing from graduallyconcentrates the homogeneousrnix the nozzle permitstheworkman to holdthe ture of air and sand without causing any sepnozzle a greaterdistance'from the work and aration as it enters the tapering bore 18,0fthis permits the sand particles, which are the nozzle. By comparingtheelongated convery hot as they issue from the nozzle, to be ical inletchamber of my nozzle with the cooled. before they strikethe work so that40 short outward fiare of prior nozzles, such as they will not injurethe same. This latter shown in the patents below mentioned, it willfeature is alsoimportant in the operation of be observed that theinclined walls of the sand blasting marble and other surfaces.

elongated chamber serve to guide the mixture I claim toward the axis ofthe nozzle without the sud- A nozzle for sand blast apparatus havingdenor abrupt change which necessarily takes an unobstructed elongatedinlet chamber hav- "place when the blast strikes the short abrupt ing alength greater than the diameter at its flare of said prior devices.mouth and provided with a conical wall grad- In alluprior sand blastnozzles with'which ually inclined to the axis ofthe nozzle and a I amfamiliar. of the type employed with apboreextending therefrom and havinga slight opening of the nozzle, the converging walls of the conicalinlet chambercausing the gradual convergence of the mixture of sand andair entering at the mouth of the nozzle, thereby preventing anyseparation of the sand particles or accumulation of sand at the'junc- 77 ture of the inlet chamber and bore of the i nozzle. a V a In testimonywhereof I affix my signature. v W

v SAMUEL NEIKIRK

